Q235A Q235B Spiral Welded Pipe

Spiral welded pipe is mainly used for oil and gas transmission pipelines, and its specifications are expressed by outer diameter * wall thickness. The spiral welded pipe has one side welding and two side welding, and the welded pipe should be tested by water pressure, the tensile strength of the weld and the cold bending performance should meet the requirements.

The spiral Angle of the spiral welded pipe is generally 50-75 degrees, so the synthetic stress at the spiral weld is 60-85% of the main stress of the straight welded pipe. Under the same working pressure, the wall thickness of spiral welded pipe with the same diameter can be reduced than that of straight welded pipe.

When the spiral welded pipe explodes, because the normal stress and synthetic stress of the weld are relatively small, the blasting opening generally does not originate from the spiral weld, which is higher than that of the straight welded pipe. When there are parallel defects near the spiral weld, the expansion risk of the spiral weld is not as great as that of the straight weld due to the small force.

Since the radial stress is the stress that exists on the steel pipe, the weld bears the load when it is in the direction of the vertical stress. That is, the load borne by the straight seam is large, the load borne by the annular weld is small, and the spiral seam is between the two.

FAQ:

1.Do you provide free samples?
Yes, we can provide free sample for testing. Buyer should bear all the shipping costs.

2. How long is your delivery time?
Generally it is 3-7 days if the goods are in stock or it is 7-15 days if the goods are not in stock. It is according to quantity.

3. What is your terms of payment ?
We accept T/T, L/C. The payment method can be negotiated by both parties according to the actual situation.

4.What is package?
Standard export packing(PVC+waterproof paper +sea-worthy wooden packing).

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